#app {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    font-family: Helvetica Neue,Helvetica,PingFang SC,Hiragino Sans GB,Microsoft YaHei,SimSun,sans-serif;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -webkit-tap-highlight-color: transparent;
    font-size: 14px;
    overflow: hidden;
    position: relative;
}

.drag-mask{
    z-index:-1!important;
}